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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eab4c60e3e118f7f9eeca073814dc0a64e34453fe3cde510901b8db38ca0f8e1' 
  AND token = '3q7OAb8upuvMEDNwIr+zvCqRq4ZURcU/DEgqkBqz6Uk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}